The structure of protein that is unaffected by heating is :

Step-by-step solution

Primary structure of proteins: Proteins may have one or more polypeptide chains. Each polypeptide in a protein has amino acids linked with each other in a specific sequence and it is this sequence of amino acids that is said to be the primary structure of that protein. Secondary structure of proteins: The secondary structure of protein refers to the shape in which a long polypeptide chain can exist. Tertiary structure of proteins: The tertiary structure of proteins represents overall folding of the polypeptide chai